2024. Citric acid production by the solid-state fermentation potential of  Aspergillus Niger using different substrate wheat straw, sugarcane waste and mixed from North Gondar area of Ethiopia. Food Science & Applied Microbiology Reports. 3, 1 (Jun. 2024), 51–60. DOI:https://doi.org/10.61363/fsamr.v3i1.146.